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x in (-oo:+oo)
10/30 = x/80 // - x/80
10/30-(x/80) = 0
1/3-1/80*x = 0 // - 1/3
-1/80*x = -1/3 // : -1/80
x = -1/3/(-1/80)
x = 80/3
x = 80/3
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